Note 1 - Nature of the Business and Operations and Liquidity (Details Textual) $ in Thousands, ¥ in Millions						1 Months Ended	3 Months Ended		12 Months Ended
	May 23, 2019 USD ($)	Mar. 28, 2019 USD ($)	Jul. 04, 2018 USD ($)	Jul. 03, 2018 CNY (¥)	Feb. 01, 2018 USD ($)	Dec. 31, 2015 USD ($)	Jun. 30, 2019 USD ($)	Jun. 30, 2018 USD ($)	Mar. 31, 2019 USD ($)	Dec. 27, 2018 USD ($)	Mar. 28, 2018 USD ($)
Retained Earnings (Accumulated Deficit), Ending Balance							$ (965,078)		$ (961,539)
Cash and Cash Equivalents, at Carrying Value, Ending Balance							73,952		77,483
Net Cash Provided by (Used in) Operating Activities, Total							$ (5,866)	$ (6,886)
Sinovel [Member]
Litigation Settlement, Amount Awarded from Other Party | ¥				¥ 57.5
Litigation Settlement, Number of Installments				2
Proceeds from Legal Settlements			$ 32,500
Litigation Receivable										$ 25,000
Gain (Loss) Related to Litigation Settlement, Total									$ 52,700
64 Jackson, LLC [Member]
Purchase and Sale Agreement, Total Consideration					$ 23,000
Purchase and Sale Agreement, Proceeds from Sale of Property, Plant and Equipment					17,000
Financing Receivable, after Allowance for Credit Loss, Noncurrent, Total					$ 6,000
Purchase and Sale Agreement, Proceeds from Sale of Property, Plant and Equipment, Net											$ 16,900
Notes Receivable, Stated Interest Rate									1.96%		1.96%
Proceeds from Collection of Notes Receivable	$ 3,000	$ 3,000
Inox Wind Limited [Member]
Supply Agreement, Aggregate Value						$ 210,000
Supply Commitment, Extension Period						3 years